Answer:
Step-by-step explanation:
Given
Required
Standard form
We have:
Remove bracket
Collect like terms
Hence, the standard form is:
So the factors are
79=2*5*7
100=2*2*5*5
2*5 is common to both so that is the greatest common factor (10)
10 is the answer
8.45% = 0.0845
0.0845(25) = 2.1...ur answer is 25
Answer:
Credit remaining after 21 minutes = $30.4
Step-by-step explanation:
Credit remaining on a phone card is a linear function of the total calling time.
When graphed, let the linear function representing the line is,
y = mx + b
Where 'm' = slope of the line
b = y-intercept
From the graph,
Slope of the line = -0.12
y = -0.12x + b
If this line passes through a point (33, 28.96),
28.96 = -0.12(33) + b
b = 28.96 + 3.96
b = 32.92
Therefore, the linear function is,
f(x) = -0.12x + 32.92
where x = calling time
Credit left in the card after 21 minutes,
f(21) = -0.12(21) + 32.92
= -2.52 + 32.92
= $30.4
; where a = 1, b = -4 and c = 8
